Abstract: In a height regulation system for a vehicle having an air spring suspension, the actual value (h) of the height of the vehicle body (10) is filtered with a short time constant (t.sub.1) to produce a first signal (NIV.sub.1) which is compared with a desired height (h.sub.o). The actual value (h) is also filtered with a longer time constant (t.sub.2) to produce a second (delayed) signal (NIV.sub.2) which can be compared with the desired value (h.sub.o). The selection of the first signal (NIV.sub.1) or the second signal (NIV.sub.2) is effected by an electronic switch (46) under the control of a velocity comparator (50). When the vehicle is at rest or moving at a relatively slow speed (below v.sub.o) at which large oscillations are not expected, the filter (40) with the shorter time constant (t.sub.1) is connected to the comparator (48) for comparison with the desired height (h.sub.o) whereas, at higher velocities (v>v.sub.o) the second filter (42) with the longer time constant (t.sub. 2) is brought into use.